My husband is looking to begin a cemetery memorial/monument making business. Any suggestions?

He is a talented and experienced stone mason and wants to expand on his fireplace-type building by beginning to make cemetery markers (an obviously continual market-place). He needs the equipment, the knowledge, etc. but it is such a specialized field that anyone he could ask for direction would ultimately be direct competition and most likely unwilling to be of help. He built a beatiful monument for my Dad, but did it all by hand--not the best use of time for business purposes. Does anyone have knowledge in this area or could you direct us to someone that does?